Question 700518
Two angles are supplements when they add up to 180

Equation 1: {{{A + B = 180}}}
Equation 2: {{{A = B + 146.4}}}
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Plug (B + 146.4) into equation 1 for A
Equation 1: {{{A + B = 180}}}
{{{(B + 146.4) + B = 180}}}
Combine like terms
{{{2B + 146.4 = 180}}}
Subtract 146.4 from both sides
{{{2B = 33.6}}}
Divide both sides by 2
{{{highlight(B = 16.8)}}}
Now plug 16.8 into equation 2 for B
Equation 2: {{{A = B + 146.4}}}
{{{A = (16.8) + 146.4}}}
{{{highlight_green(A = 163.2)}}}